Hm, i don't see why its not possible. I just picked up a decent 240 for 'very' little. Lets just say i paid more than 1 dollar and less than 500. Being that i'll be putting my own/different motor in it i didn't care that this one wasn't running. If you wrench on it on your spare time i don't see why one couldn't do it.
Then again, why go the played out direction. What about throughing an SR in the FD? I know a guy that recently threw in a VQ from a maxima and the 6-speed from a 350z into one. If he can do that in his garage only working a few hrs each weekend, then surely you could fit the sr.